1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories (UL). Itis normative for the applicable
2、UL Product Certification Program(s); however, it is currently not part ofthe UL Standard(s) referenced below.Product Category (CCN): NBSXStandard Number: UL 1023Edition Date: November 25, 1996Edition Number: 6Section / Paragraph Reference: 48.4DECISION:The standard will be revised as follows:48.4.1
3、Each input/output circuit is to be tested as specified in 48.4.2 - 48.4.5. The signaling equipmentconnected to these circuits shall not false alarm, operate as intended, and, as appropriate, retain requiredstored memory (such as date, type, and location of a signal transmission) within the unit when
4、 subjectedto transient voltage pulses as described in 48.4.3. Supplemental information stored within the unit neednot be retained.Exception: A circuit or cable that interconnects equipment located within the same room need not besubjected to this test.48.4.2 The unit is to be energized in the normal
5、 standby condition while connected to a source of supplyin accordance with Table 25.1.48.4.3 For this test, each input/output circuit is to be subjected to five different transient waveforms havingpeak voltage levels in the range of 100 to 2400 volts, as delivered into a 200 ohm load. A transientwav
6、eform at 2400 volts shall have a pulse rise time of 100 volts per microsecond, a pulse duration ofapproximately 80 microseconds, and an energy level of approximately 1.2 joules. Other applied transientsshall have peak voltages representative of the entire range of 100 to 2400 volts, with pulse durat
7、ions from80 to 1110 microseconds, and energy levels not less than 0.03 joule or greater than 1.2 joules. Thetransient pulses are to be coupled directly onto the output circuit conductors of the equipment under test.48.4.4 Each input/output circuit is to be subjected to 60 transient pulses introduced
8、 at the rate of six pulsesper minute as follows:a) Ten pulses (two at each transient voltage level specified in 48.4.3) between one side of eachinput/output circuit and earth ground. Repeat the ten pulses with the polarity reversed (total of20 pulses).b) Repeat (a) between the other side of each inp
9、ut/output circuit and earth ground (total of 20pulses).c) Ten pulses (two at each transient voltage level specified in 48.4.3) across each input/outputcircuit. Repeat the ten pulses with the polarity reversed (total of 20 pulses).48.4.4.1 For these testsa, the transient generator is to be connected
10、to its alternating current (AC) powersource through an isolating transformer. The earthground of the transient generator is to be disconnectedfrom earthground.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULa) For 48.4.4(a) and (b), one output
11、 of the transient generator is connected to the earthgroundconnection of the product under test, and the other output is connected through a decouplingfixture to the terminal to be tested. To reverse the polarity, the connection at the product undertest is reversed. The earthground of the product sh
12、all be connected to earthground.b) For 48.4.4(c), one output of the transient generator is connected to one of the terminals tobe tested and the other output is connected through a decoupling fixture to the other terminal tobe tested. To reverse the polarity, the connection at the product under test
13、 is reversed. If theproduct is equipped with an earthground, it shall be connected to earthground.The decoupling fixture is a 200-ohm, 10-watt (minimum) resistor in series with a 1-microfarad, 1000-voltDC (minimum) capacitor.aCAUTION: Potentially lethal voltage are involved. The transient generator
14、and the product under test are to be on a non-conductivesurface and appropriate safety precautions observed.48.4.3 For this test, each input/output circuit is to be subjected to the transient waveforms specified in thefollowing table, as delivered into a 200-ohm load. The transient pulses are to be
15、coupled directly onto theoutput circuit conductors of the equipment under test.Peak voltage level, V Minimum energy level, J Minimum pulse duration,sFigure No.2400 1.0 80 48.4.11000a0.31 150 48.4.2500a0.10 250 48.4.3100 0.011 1120 48.4.4aOther applied transients having peak voltages representative o
16、f the entire range of 100 - 2400 volts shall be used in lieu ofthese values when the output circuit is only designed specifically to protect against these predetermined values. Thetransients shall meet or exceed the specified minimum pulse duration (Figure 48.4.5) and minimum energy level (Figure48.
17、4.6) parameters, and shall have an equal or faster minimum transient pulse rise time than that specified in Figure 48.4.7.This is generated text for figtxt.STANDARD NUMBER: UL 1023 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 48.4
18、.1Signal line transients 2400V curveFigure 48.4.2Signal line transients 1000V curveSTANDARD NUMBER: UL 1023 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 48.4.3Signal line transients 500V curveFigure 48.4.4Signal line transients 10
19、0V curveSTANDARD NUMBER: UL 1023 -4-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 48.4.5Minimum transient pulse duration vs. transient peak voltageFigure 48.4.6Minimum transient energy level vs. transient peak voltageSTANDARD NUMBER:
20、UL 1023 -5-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL48.4.4 Each conductor of a circuit is to be subjected to 40 transient pulses induced at the rate of six pulsesper minute as follows:a) Twenty pulses (four at the 2400 peak voltage leve
21、l and two at each of the other transientvoltage levels specified in 48.4.3) between each lead or terminal and earth ground, consisting often pulses of one polarity, and ten of the opposite polarity andb) Twenty pulses (four at the 2400 peak voltage level and two at each of the other transientvoltage
22、 levels specified in 48.4.3) between any two circuit leads or terminals consisting of tenpulses of one polarity and ten pulses of the opposite polarity.48.4.5 At the conclusion of the test, the equipment shall comply with the requirements of the OperationTest, Section 26.RATIONALE FOR DECISION:The c
23、hanges reflect the tolerances of the transient generating equipment commercially available toconduct the test.Copyright 2007 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Deci
24、sions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National S
25、tandards Institute (ANSI) processes. UL shall not be responsible toFigure 48.4.7Minimum transient pulse rise time vs. transient peak voltageSTANDARD NUMBER: UL 1023 -6-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULanyone for the use of or re
26、liance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirem
27、ent Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1023 -7-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 1023 -8-No Text on This Page
